Device for sharpening chain saw chains



M, 195 R. n... TRAVIS 2,859,642

DEVICE FOR SHARPENING- CHAIN SAW CHAINS Filed May 9. 195a IN V EN TOR.

22 ,5. 7 3 Par/p6 L- Tr y/1 H TTORNEY DEVICE FOR SHARPENING CHAIN SAW CHAINS Ralph L. Travis, Sidney, Iowa, assignor of one-hall? to E. D. Schade and one-half to Donald Moseley, both of Sidney, liowa Application May 9, 1956, Serial No. 583,842

3 Claims. (Cl. 76-31) My invention relates to a device for sharpening chain saw chains.

An object of my invention is to provide a device which can be conveniently clamped in a vise or otherwise secured, and which will clamp a chain saw chain therein so that the cutting portions of the chain saw can be readily sharpened, and also accurately sharpened to the required accuracy.

A further object of my invention is to provide an arrangement which is adjustable in that the device can be adjusted to sharpen the cutting element to desired angles.

A further object of my invention is to provide a device of this character which can be swung to alternate positions so as to accommodate the alternate pitched cutting elements, and to provide adjustable stop members for automatically limiting the movement of the slidable members so that the device will be fool-proof.

With these and other objects in view, my invention consists in the construction, arrangement, and combination of the various parts of my device, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims, and illustrated in the accompanying drawings, in which:

Figure 1 is a plan view of the device,

Figure 2 is an end sectional view taken generally along the lines 2-2 of Figure l, with the unit at zero position.

Figure 3 is a side view of Figure 1, and

Figure 4 is a sectional detail taken along the lines 4-4 of Figure 1.

I have used the character to designate a horizontally positioned bar suitably secured as at 11 to the vertical posts 12 which posts 12 are secured at 13 to a semi-circular platform element 14 (see Figure 1) which includes a zero marking at 15 and the other angular markings at 16 and 17. Extending from the bar 10 are the vertically positioned posts 18 in which are threadably engaged the threaded screws 19 including the locking nuts 20 (see Figure 1). The plate 14 is secured to a further horizontal bar 21 from which extends the vertically positioned portion 22 which includes a slot 23 therein through which slot passes the bolts 24 and 25, the bolt 25 being tightened by means of the nut 26, the nut 26 hearing against the further slidable member 27.

The bolts 24 and 25 pass through a pair of clamping plates 28 which are adapted to receive the chain itself, this chain comprising the links 29, portions 30 and the oppositely pitched cutting teeth 31 and 32, the chain also including the lower portions 33 which travel between the plates 28. Engaging the threaded bolt 24 is the knurled turning handle 34.

Passing through the upper member 10 is a threaded stud 35 which engages a further knurled rotatable knob 36 which stud engages the further circular member 37, this arrangement permitting adjustment for wider or narrower chains, the stud 35 being also secured to the horizontal member 38 having the integral vertically positioned portions 39 and 40 having openings 41 for the nited States atent O ICC smooth reception of the horizontally positioned bar 42, the bar 42 extending into the downwardly positioned end 43 to which is attached at 44 the round file 45 which also is attached to a bar 46 which is attached to the bar 42 at 47. Attached to the end of the file 45 is the handle 48. Also secured beneath the member 38 by means of suitable nuts as shown is an adjustable member comprising the horizontal portion 49 which bends downwardly into the angular portion 50 which portion 50 extends into a pair of stop portions 51, and attached to the member 49 is a lengthened set screw 52 which abuts against the top of the member 49 for the adjust ment which will be explained later.

The member 40 includes an upwardly extending portion 53 with which is engaged the threaded stud 54 terminating in the thumb portion 55 which stud 54 is adapted to bear against the member 37 after the adjustment is made to rigidity the structure thereat. Also passing through the horizontal bar 21 are a pair of screws 56 which are adapted to compensate for worn chain rivets, if such is required, and to effect a slight adjustment laterally.

The device is operated in the following manner. First, it will be noted that the plates 28 can be moved upwardly or downwardly by virtue of the slot 23 which plates can then be tightened together and clamping the lower portions 33 of the chain. By virtue of this arrangement the chain can be inserted between the plates 28 and then be ready for the filing operation.

The teeth 31 which are first to be filed are placed so that when the plates 28 are brought upwardly these teeth will lie approximately in the position as shown in Figure 4, and the left hand stop member 51 will limit the movement of the chain upwardly, and the file will lie more or less centrally between the two stops 51, the file will then be swung to the left and by pushing the handle 48 forwardly during the filing stroke, the tooth cutting edge 31 will thus be sharpened. The file can be brought back to center between the stops 51 between each successive stroke, if such is desired.

The angle of cut can be adjusted by merely sighting downwardly on the bar 42 against the angle markings as shown and at first the right hand screw 19 is adjustably positioned so that the upper portion 53 will bear against the end thereof whereby the arrangement is then locked by means of the knurled knob 36. When it is desired to efiect vertical adjustment for varying chain widths as explained above, the member 37 can be rotated on the stud and then re-locked by means of the screw 54. The set screw 52 provides means whereby the member 49 and the stops 51 can be ad justed as to vertical height by merely rotating this set screw as desired, the most satisfactory out being obtained when one-fifth of the round file is above the top of the tooth and four-fifths below. After the tooth 31 is filed, the knob 34 is loosened and the chain is pulled over until the next tooth 31 is in position and the same operation is then repeated, the member 34 permitting lowering and raising of the chain as required for these operations. In this way all of the teeth or cutting elements 31 will be efiiciently sharpened and will be accurately sharpened automatically without employing cumbersome hand methods.

These chain saw chains also have the teeth 32 as explained above which are pitched oppositely to the teeth 31, and when it is desired to sharpen these teeth 32 the top of the arrangement is merely loosened and the member 49 etc. is then swung to the opposite position and the bar 42 can then be aligned with the angle markings 16 as shown in Figure l, with the left hand screw 19 being adjusted to bear against the member 53 at the other side thereof, whereby the filing can then take place with the arrangement swung completely over to thepther position. The slidable engagement of the bar 42 with the members 39 and 4a permits a smooth and uniform stroking action of the file, and it should he understood that slight modifications could be made without departing from the essential spirit of my invent'ion. The piece 22 is used for clamping or supporting the entire arrangement in a vise etc. and if desired, a hole could be bored through this piece for a similar purpose. It will now be noted that I have provided the ad vantages mentioned in the objects of my invention.

Some changes may be made in the construction and arrangement of the parts of my invention without departing from the real spirit and purpose of my invention, and it is my intention to cover by my claims any modified forms of structure or use of mechanical equivalents which may be reasonably included within their scope. I claim as my invention: y l. A device for sharpening chain saw chains comprising a stationary framework, a pair of spaced plates slidable vertically in said framework, means for tightening said plates together to secure a chain saw chain therebetween, a filing member arranged for slidable movement with respect to said framework for filing the cutting teeth of said chain, said filing member including 'a carriage for slidably receiving said filing member, means for positioning said carriage at desired angles, means for adjustably positioning said carriage vertically to adjust for various widths of chain saw chains, stop means for limiting upward movement of said chain saw chains, said stop means including horizontally extending prongs between which said filing member is positioned.

2. A device for sharpening chain saw chains comprising a stationary framework, a pair of spaced plates slidable vertically in said framework, means for tightening said plates together to secure a chain saw chain therebetween, a filing member arranged for slidable movement with respect to said framework for filing the cutting teeth of said chain, said filing member including a carriage for slidably receiving said filing member, means for positioning said carriage at desired angles, means for adjustably positioning said carriage vertically to adjust for various widths of chain saw chains, stop means for limiting upward movement of said chain saw chains, said stop means including horizontally extending prongs between which said filing member is positioned, said prongs including upwardly extending portions secured to said carriage, means for adjustably positioning said upwardly extending portions to thereby vary the filing area of said filing member according to the limiting effect of said prongs.

3. A device for sharpening chain saw chains comprising a stationary framework, a pair of spaced plates slidable vertically in said framework, means for tightening said plates together to secure a chain saw chain therebetween, a filing member arranged for slidable movement with respect to said framework for filing the cutting teeth of said chain, said filing member including a carriage for slidably receiving said filing member, means for positioning said carriage at desired angles, means for adjustably positioning said carriage vertically to adjust for various widths of chain saw chains, stop means for limiting upward movement of said chain saw chains, said stop means including horizontally extending prongs between which said filing member is positioned, said prongs including upwardly extending portions secured to said carriage, means for adjustably positioning said upwardly extending portions to thereby vary the filing area of said filing member according to the limiting eiiect of said prongs, said angle positioning means including a substantially semi-circular plate extending from said framework including angle markings at either side thereof, adjustably limiting means for limiting said carriage angularly, and whereby said carriage can be swung from one side to the other to provide filing of chain saw chain teeth which have opposite pitches.

References Cited in the file of this patent UNITED STATES PATENTS 35,935 Hawley Jfily 22, 1862 310,735 Sherman Jan. 13, 1385 905,924 Reynolds Dec. 8, 1908 1,165,248 Hanson Dec. 21, 1915 2,138,395 Anderson Nov. 29, 1938 2,410,828 Lofstrand Nov. 12, 1946 2,589,165 Toy et al. Mar. 11, 1952 2,633,761 Butts Apr. 7, 1953 2,679,171 Rosenlund May 25,1954 

